Faraday rotation variations along radio jets: the magnetic field in galaxy and group halos

Abstract

Our modelling of FR I radio jets as decelerating, relativistic flows allows us to derive their orientations accurately. We present images of Faraday rotation for two of these these objects (3C 31 and NGC 315) and show that the fluctuations of rotation measure (RM) are larger in the fainter (receding) jets, as expected if the rotation occurs in the hot galaxy/group halos. The gas density is much lower in NGC 315 and the RM fluctuations are only just detectable.

arXiv comment3 pages, 2 figures, requires an.cls. To appear in the Proceedings of the International Conference: "The Origin and Evolution of Cosmic Magnetism"; Bologna 29 August - 2 September 2005; eds R. Beck, G. Brunetti, L. Feretti, and B. Gaensler (Astronomische Nachrichten, 2006)

References in corpus (5)

• Relativistic models and the jet velocity field in the radio galaxy 3C 31
• A Chandra observation of the X-ray environment and jet of 3C31
• The X-ray jet and central structure of the active galaxy NGC 315
• A relativistic model of the radio jets in NGC 315
• Pacman (I): A new Algorithm to calculate Faraday Rotation Maps

Cited by in corpus (4)

• The Westerbork SINGS Survey II. Polarization, Faraday Rotation, and Magnetic Fields
• Integrated Polarization of Sources at lambda ~1m and New Rotation Measure Ambiguities
• Parsec-scale Faraday Rotation Measures from General Relativistic MHD Simulations of Active Galactic Nuclei Jets
• 2-D Magnetohydrodynamic Simulations of Induced Plasma Dynamics in the Near-Core Region of a Galaxy Cluster